package com.gubei.subject.domain.util;

import com.alibaba.fastjson.JSON;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Component;
import org.springframework.util.CollectionUtils;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.function.Function;

@Component
public class CacheUtil<K,V> {
    private Cache<String,String> localCache = CacheBuilder
            .newBuilder()
            .maximumSize(5000)
            .expireAfterWrite(10, TimeUnit.SECONDS)
            .build();

    public List<V> getResult(String cacheKey, Class<V> clazz, Function<String,List<V>> function) {
        List<V> resultList = new ArrayList<>();
        String content = localCache.getIfPresent(cacheKey);
        if (StringUtils.isNotBlank(content)) {
            resultList = JSON.parseArray(content, clazz);
        }else{
            resultList = function.apply(content);
            if(!CollectionUtils.isEmpty(resultList)){
                localCache.put(cacheKey,JSON.toJSONString(resultList));
            }
        }
        return resultList;
    }
}
